Novel n-arylsulfonyl-n&#39;-(2, 5-endomethylene-1, 2, 5, 6-tetrahydrobenzyl) ureas



United States Patent Ofifice 3,072,720 NOVEL N-ARYLSULFONYL-N-(2,5-ENDOMETHYL- ENE-1,2,5,6-TETRAHYDROBENZYL)UREAS John B. 1 Wright, Kalamazoo Township, Kalamazoo County, Mich., assignor to The Upjohn Company, Kalamazoo, Mich., a corporation of Delaware No Drawing. Filed Apr. 7, 1960, Scr. No. 20,522 8 Claims. (Cl. 269-553) The present invention relates to novel N-arylsulfonyl- N (2,5 endomethyiene 1,2,5,5-tetrahydrobenzyl)ureas and to orally active compositions containing said novel compounds as active ingredients.

The novel N-arylsulfonyl-N'-(2.5-endomethylene-1,2,5, G-tetrahydrobenzyl)ureas of the present invention can be represented by the formula:

-FO2NH-(IIJNIICTM@ X t wherein X and Y represent hydrogen; alkyl'containing 1 to 4 carbon atoms, inclusive, e'.g., methyl, ethyl, propyl, butyl, isopropyl, isobutyl, and the like; alkoxy containing 1 to 4 carbon atoms, inclusive. e.g., methoXy, ethoxy, propoxy, butoxy, sec-butoxy, and the like; the acyl group of an alkanoic acid containing 2 to 4 carbon atoms, inclusive, e.g., acetyl, propionyl, butyryl, and isobutyryl; halogen, e.g., chlorine, bromine, and fluorine; and the primary amino radical (Ni-l The novel compounds of the present invention are orally active antidiabetic agents useful for lowering blood sugar content in mammals, especially humans, to a safe level for periods of time and at dosages of the order disclosed below. The novel compounds are also useful as wetting, emulsifying and waterproofing agents in the paper and leather industry.

The novel N-arylsulfonyl-N'-(2,5-endomethylene-1,2,5, 6-tetrahydrobenzyl)ureas of the present invention can be prepared by reacting an arylsulfonylurethane having the formula:

wherein R represents alkyl containing 1 to 6 carbon atoms,

inclusive, and X and Y represent hydrogen; alkyl containing 1 to 4 carbon atoms, inclusive, e.g., methyl, ethyl. propyl, butyl, isopropyl, isobutyl, and the like; alkoxy containing 1 to 4 carbon atoms, inclusive, e.g., methoxy,

" ethoxy, propoxy, butoxy, sec-butoxy, and the like; the

acyl group of an alkanoic acid containing 2 to 4 carbon atoms, inclusive, e.g.,. acetyl, propionyl, butyryl, and iso butyryl; halogen, e.g., chlorine, bromine, and fluorine; and nitro, with 2,5-endomethylene-1,2,5,6-tetrahydrobenzylamine having the formula:

zenesulfonyl) N'-(2,5-endomethylene-1,2,5,6-tetrahydrobenzyl) urea.

The starting arylsulfonylurethanes, many of which are known, can be prepared as disclosed by Marshall et al., supra.

The starting 2,5-endomethylene-1,2,5,6-tetrahydrobenzylamine can be prepared according to the process disclosed by Alder et al., Ber., 71, 1953, 1938, which process involves reacting allylamine with cyclopentadiene at atemperature of about 170 C.

The starting 2,5-endomethylene-1,2,5,6-tetrahydrobenzylamine can also be prepared by reacting 2,5-endomethylene-1,2,5,6-tetrahydrobenzaldehyde with hydroxylamine, preferably in the presence of pyridine, picoline,

' or the like, to produce 2,5-endomethy1ene-1,2,5,6-tetrahydrobenzaldehyde oxime and reducing the oxime with lithium aluminum hydride.

The following examples are illustrative of the process and products of the present invention, but are not to b construed as limiting.

EXAMPLE 1 (A) 2,5 endomcllzylene-1,2,5,6-telrahydr0benzaldehyde 0xi/ne:--A mixture of 24.4 g. (0.2 mole) of 2,5- endomcthylene-l,2,5,6-tetrahydrobenzaldehyde (Diels et al., Ann.. 460, 119, 1928), 13.9 g. (0.2 mole) of hydroxylamine hydrochloride, 100 m1. of dry pyridine, and 100 ml. of absolute ethanol was refluxed for 3 hours. The solvents were removed under reduced pressure at 40 C. The residue was diluted with 100 ml. of water, the mixture was extracted with ether, and the ether extract was dried with anhydrous magnesium sulfate and concentrated to dryness. The residual yellow oil weighing 27.9 g. was dissolved in ether and the solutionwas extracted with 5% aqueous sodium hydroxide solution. The alkaline solution was acidified with acetic acid, the resulting mixture was extracted with ether, and. the ether extract was dried with anhydrous magnesium sulfate and concentrated to dryness, to give 25.4 g. of 2,5-endomethylenel,2,5,6-tetrahydrobenzaldehyde oxime as a yellow oil.

(13) 2,5 enzlwnethylene I,2,5,6 tetralzydrobenzylamine.A mixture of 19 g. (0.5 mole) of lithium aluminum hydride and 400 ml. of ether was refluxed for 1 hour. To the mixture was cautiously added 25.4 g. (0.184 mole) of 2,5-endomethylene-1,2,5,6-tetrahydrobenzaldehyde oxime dissolved in 100 ml. of ether. The mixture was refluxed for 2 hours before being decomposed by the successive addition of 7.4 ml. of water, 5.5 ml. of 20% aqueous sodium hydroxide solution, and 25.8 ml. of water. was washed with ether. was dried over anhydrous magnesium sulfate and concentrated to dryness. The residue was distilled under reduced pressure to give 9.54 g. (43% of theory) of 2,5- F

endomethylene-1,2,5,o-tetrahydrobenzylamine as a colorless oil boiling at 65-69 C./14 mm.

AnaIysis.Calcd. for C l-l ll: C, 77.99; H, 10.64; N,

11.37. Found: C, 78.17; H, 10.17; N, 11.37.

(C) N (4 methylbenzenesulfonyl) N (2,5-end0- methylene-I,2,5,6-tetral1ydr0benzyl)urea.A mixture of 24.33 g. (0.1 mole) of 4-methylbenzenesulfonylurethane Patented Jan. 8, 1963' The mixture was filtered and the filter cake The filtrate, including washes,

water. The damp cake was then recrystallized from ethanol to give 17.44 g. (54.5% of theory) of N-(4- methylbenzenesulfonyl) N (2,5 endomethylene- 1,2.5,6-tetrahydrobenzyl)urea which melted at 178- 180 C.

AnaIysis.--Calcd. for C H N O S: C, 59.98; H, 6.29; N, 8.76; S, 10.01. Found: C, 60.03; H, 6.03; N, 8.76; S, 10.02.

ExAMPLE 2 N-(4-Chl0r0benzenesulfonyl) -N'-(2,5-End0methylene- 1,2,5,6-Telrahydrobenzyl) Urea A mixture of 20.1 g. (0.077 mole) of 4-chlorobenzenesulfonylurethane and 9.4 g. (0.077 mole) of 2,5-endomethylene-1,2,5,6-tetrahydrobenzylamine was stirred and heated at 130 C. for 2 hours, and then heated at the same temperature, under reduced pressure, to remove the ethanol formed during the reaction. Upon recrystallization of the residue from ethyl acetate there was obtained 13.8 g. of tan prisms melting at 169-172 C. A second recrystallization from ethyl acetate gave N44 chlorobenzenesulfonyl) N (2,5 endomethylene 1,2- 5,6-tetrahydrobenzyl)urea which melted at 173-176 C.

AnaIysis.-Ca1cd. for C H ClN O S: C, 52.86; H, 5.03; Cl, 10.40; N, 8.22; S, 9.41. Found: C, 53.21; H, 5.40; Cl, 10.50; N, 8.09; S, 9.17.

EXAMPLE 3 N-(4-Methoxybenzenesulfonyl -N 2,5 -Endmethylene-I,2,5,6-Tetmhydr0benzyl) Urea In the same manner as shown in Example 1, part C, N (4 methoxybenzenesulfonyl) N-(2,5-endomethylene-l,2,5.6-tetrahydrobenzyl)urea was prepared by using 4-methoxybenzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 4 N-Benzenesulfonyl-N (2,5-End0methylene-1,2,5,6- T etrahydrobenzyl Urea In the same manner as shown in.Examp1e 1, part C, N- benzenesulfonyl N (2,5 endomethylene-l,2,5,6-tetrahydrobenzyl)urea was prepared by using benzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 5 N- (3,4-Diethylbenzenesulfonyl) -N-(2,5-Endomethylene-I ,2,5,6-Tetrahydrobenzyl) Urea In the same manner as shown in Example 1, part C, N (3,4 diethylbenzenesulfonyl) N (2,5 endomethylene-1,2,5.6-tetrahydrobenzyl)urea was prepared by using 3,4-diethylbenzenesulfonylurethane instead of 4- methylbenzenesulfonylurethane.

EXAMPLE 6 N-(3,4-Dibr0m0benzenesulj'onyl)-N'-(2,5-End0merhylene-1 ,2,5,6-Tetrahydrobenzyl) Urea In the same manner as shown in Example 1, part C, N- (3,4 dibromobenzenesulfonyl) N (2,5 endomethylene-l,2,5,6-tetrahydrobenzyl)urea was prepared by using 3,4-dibromobenzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 8 N-(4-Propylbenzenesulfonyl) -N'-(2,5-Endomethylene- 1,2,5,6-Tetrahydrobenzyl) Urea 4 In the same manner as shown in Example 1, part C, N (4 propylbenzenesulfonyl) N (2.5 endomethylcnc-1,2,5.(a-tetrzihydrobenzyl)uren was prepared by using 4-propylbenzencsulfonylurethane instead of 4-methylbenzenesulionylurethane.

EXAMPLE 9 N-(4-ButyIbenzenesulfonyl)-N'-(2,5-End0methylene- 1,2,5,6-Tetralzydrobenzyl) Urea In the same manner as shown in Example 1, part C, N- (4 but 'lbenzenesulfonyl) N (2,5 endomethylene- 1,2,5,6-tetrahydrobenzyl)urea was prepared by using 4- butylbenzenesulfonylurethane instead of 4-rnethylbenzenesulfonylurethane.

EXAMPLE 10 N-(3-Pr0p0xybenzenesulfonyl)-N'-(2,5-Endomethylene-I,2,5,6-Tetralzydr0benzyl) Urea In the same manner as shown in Example 1, part C, N (3-propoxybenzenesulfonyl) N (2,5-endomethylene-1,2,5,6-tetrahydrobenzyl)urea was prepared by using 3-propoxybenzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 11 N-(4-Bul0xybenzenesulfonyl)-N-(2,5-End0methylene-I ,2,5,6-Tetra/iydr0benzyl) Urea In the same manner as shown in Example 1, part C, N- (4 butoxybenzenesultonyl) N (2,5 endomethylene- 1,2,5,6-tetrahydrobenzyl)urea was prepared by using 4- butoxybenzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 12 N-( 4 -F luorobenzenesul fonyl -N 2,5 -E ndom ethylene- 1,2,5,6-Tetrahydr0benzyl) Urea In the same manner as shown in Example 1, part C, N (4 fiuorobenzenesulfonyl) N (2,5 endomethylene-1,2,5,6-tetrahydrobenzyl)urea was prepared by using 4-fluorobenzene-sulfonylurethane instead of 4-methy1 benzenesulfonylurethane.

EXAMPLE 13 N-(3,4-Dichlar0benzenesulfonyl)-N-(2,5-End0methylene-I ,2,5,6-Tetraltydrobenzyl) Urea In the same manner as shown in Example 1, part C, N- (3,4 dichlorobenzenesulfonyl) N (2,5-endomethylene-1,2,5,6-tetrahydrobenzyl)urea was prepared by using 3,4-dich1orobenzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 14 N-(3-M eth yl-4-C/2Ior0bcnzerzesul fonyl )-N 2,5 -End0- methylene-1,2,5,6-Tetrahydr0benzyl) Urea In the same manner as shown in Example 1, part C, N (3 methyl 4 chlorobenzenesulfonyl) N (2,5 endomethylene-1,2,5,6-tetrahydrobenzyl)urea was prepared by using 3-methyl-4-chlorobenzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 15 EXAMPLE 16 N-(S-Aminobenzenesulfonyl)-N'-(2,5-Endomethylene- 1,2,5,6-Tetrahydr0benzyl) Urea (A) N-(3 nitrobenzerzesulfonyl) -N-(2,5-endamethylene-1,2,5,6-telrahydrobenzyl) urea.--Ln the same manner as shown in Example 1, part C, N(3-nitrobenzenesulfonyl N (2,5 endomethylene 1,2,5,6 tetrahydrobenzyl)urea was prepared by using 3-nitrobenzenesulfonylurethane instead of 4-rnethylbenzenesulfonylurethane.

(B) N-(3 -aminobenzenesulfonyl)-N-(2,5 endomethylene-1,2,5,6-tetrahydmbenzyl)urea.-N (3 nitrobenzenesulfonyl) N (2,5 endomethylene 1,2,5,6 tetra-.

hydrobenzyl)urea was hydrogenated in an aqueous ammonium hydroxide solution containing 1.5% ammonia,

by weight, with l0% palladium-o'n-charcoal catalyst. The resulting crude product, obtained iby filtering the reaction mixture and evaporating the filtrate to dryness, was recrystallized from 95 ethanol to produce N-(3-aminobenzencsulfonyl) N (2,5 endomethylene 1,2,5,6 tetrahydrobenzyl)urea.

EXAMPLE 17 N-(3-A m in0-4-M erh ylbenzencsulfonyl )-N 2,5 -End0- methylene-1,2,5,6-Tetrahydrobenzyl) Urea (A) N-(3-nitr0-4-mcthylbcnzencsulfonyl)-N-(2,5-endomethylcne-l ,2,5,6-tetrahydr0be/zzyl) urea-In the same manner as shown in Example 1, part C, N-(3-nitro-4- methylbenzenesulfonyl) N' (2,5 endornethylene 1,2,5,6-tetrahydrobenzyl)urea was prepared by using 3- nitro-4-rnethylbenzenesulfonylurethane instead of 4-methylbenzenesulfonylurethane.

(B) N (3 -amill0-4-metllyIbenzenesulfonyl)-N'-(2,5-

endomethylene 1,2,5,6 telrahydrobenzyl)urea.In the same manner as shown in Example 16, part B, N-(3- amino 4 methylbenzenesulfonyl) N (2,5 endomethylene-l,2,5,6-Tetrahydrobenzyl)urea was prepared by ,hydrogenating N-(3-nitro-4-methylbenzenesulfonyl)- N-(2,5-endomethylene-1,2,5,6-tetrahydrobenzyl)urea instead of N-(3-nitrobenzenesulfonyl)-N-(2,5-endomethylene-l ,2,5,6-tetrahydrobenzyl) urea.

EXAMPLE 18 N-(4-Acetylbenzciwsulfonyl)-N'-(2,5-End0methylene- 1,2,5,6-Tetra/1ydr0bcnzyl) Urea In the same manner as shown in Example 1. part C, N (4 acetylbenzenesulfonyl) N (2,5 endomethylenc-l,2.5,6-tctrahydrobcnzyl)urea was prepared by using 4-acetylbenzenesulfonylurethane instead of 4-rnethylbenzenesulfonylurethane.

' EXAMPLE 19 N-(Z-Methylbenzencsulfonyl)-N (2,5-End0methylene- I,2,5,6-Tetra/rydrobenzyl) Urea In the same manner as shown in Example 1, part C,

I N (2 -'methylbenzenesulfonyl) N (2,5 endomethylene-l,2,5,6-tetraliydrobenzyl)urea was prepared by using 2-methylbenzenesulionylurethane instead of 4-methylbenzenesulfonylurethane.

EXAMPLE 20 N-(4-Is0pr0pylbelzzenesulfonyl)-N'-(2,5-Endomelhylene- 1,2,5,6-Tetrahya'r0benzyl) Urea In the same matter as shown in Example 1, part C, N (2,4 dibutyrylbenzenesulfonyl) N (2,5-endomethylene-l,2,5,6-tetrahydrobenzyl)urea was prepared by using 2,4-dibutyrylbenzenesulfonylurethane instead of 4- I methyl-benzenesulfonylurethane.

EXAMPLE 23 N-(4-ChI0r0-3-Me1l1ylbenzenesulfonyl )-N 2-5 -End0- methylene-1,2,5,6-Tetrahydr0benzyl) Urea In the same manner as shown in Example 1, part C, N (4 chloro 3 methylbenzencsulfonyl) N (2,5 endomethylcne-l.2,5,6-tetrahydrobenzyl)urea was prepared by using 4-chlore-3-mcthylbenzenesulfonylurethane instead of 4-methylbcnzcnesulfonylurethane.

As indicated hereinbefore the compounds of the present invention are useful in the lowering of blood sugar perorally and for this purcose the active compounds are associated with a pharmaceutically acceptable carrier.

For such oral administration the active compounds can 7 1 be administered in liquid or solid dosage forms. Solid forms include capsules, tablets, powders, pills, granules, and the like, and liquid forms include suitably flavored aqueous suspensions and solutions (depending on concentration desired), and flavored oil suspensions and solutions wherein edible oils, e.g., corn oil, cottonseed oil,

coconut oil, peanut oil, sesame oil, or mixtures of these, and the like can be employed.

For preparing compositions such as tablets and other compressed formulations the composition can include any compatible and edible, tableting material used in pharmaceutical practicef e.g., corn starch, lactose, dibasic calcium phosphate, stearic acid, magnesium stearate, ,talc, methyleellulose, and the like, can be em-.

ployed.

Similarly, the compounds of the present invention can be mixed with suitable adjuvants for the preparation of resorbable hard gelatin or soft gelatin capsules utilizing conventional pharmaceutical practices.

The following illustrative compositions are within the scope of the present invention:

( l) HARD GELATIN CAPSULES 10,000 two-piece hard gelatin capsules for oral use, each containing milligrams of N-(4-chlorobenzenesulfonyl)-N'-(2,5 endomethylene 1,2,5,6 tetrahydrobenzyl)urea are prepared from the following amounts and types of materials:

Grams N (4-chlorobenzenesulfonyl) N'-(2,5-endomethylene-l,2,5,6-tetrahydrobenzyl)urea 1500 Corn statrch 1616 Mineral oil, U.S.P. a 129.6 Magnesium stearate, powder 162 Talc, U.S.P. 162

The powdered N-(4-chlorobcnzenesulfonyl)-N'-(2,5-# endomethylene-l,2,5,6-tetrahydrobenzyl)urea is mixed thoroughly with the rest of the ingredients and then caspulated.

(2) SOFT GELA'IIN CAPSULES One-piece soft gelatin capsules for oral use, each containing 50 milligrams of N-(3,4-dichlorobenzenesulfonyl).

N-(2,5-endomethylene-1,2',5,fi-tetrahydrobenzyl)urea are prepared in the usual manner by first dispersing the active ingredient in sulficient corn oil to render the material capsulatable.

(3) OIL SUSPENSION An oil suspension for oral use, containing in each 5 milliliters 500 milligrams of N-(4-methylbenzenesulfonyl)-N'-(2,5-er1domethylene-1',2,5,6 tetrahydrobenzyl) urea is prepared from the following types and amounts of materials:

sweetening agent gm 3.5 N (4-methylbenzenesulfonyl)-N'-(2,5-endomethylene-1,2,5,6-tetrahydrobenzyl)urea "gm..- 1000 7 Preservative gm 20 Antioxidant gm 1 Flavoring ml- 25 Aluminum monostearate-corn oil gel to make 10,000 ml.

(4) TABLET 10,000 oral tablets each containing 150 milligrams of N (4 chlorobenzenesulfonyl)-N'-(2,5-endomethylene- 1,2,5,6-tetrahydrobenzyl)urea are prepared from the fol- The ingredients are mixed in a conventional manner and compressed into tablets, each containing 150 mg. of active ingredient.

(5) SYRUP A sugar-free syrup for oral use containing in each 5 milliliters 500 milligrams of N-(4-propylbenzenesulfonyl)- N'-(2,5-endornethylene-l,2,5,6-tetrahydrobenzyl)urea is prepared from the following types and amounts of materials:

N (4 propylbenzenesulfonyl)-N-(2,5-endomethylene-l,2,5,6-tetrahydrobenzyl)urea gm 1000 Methylparaben U.S.P gm 3 Sorbic acid gm 3 Sweetening agent gm 18 Flavoring ml 3 Glycerin ml 1500 Deionized water to make 10,000 m1.

A dose of l teaspoonful (5 ml.) to 1 tablespoonful ml.) will give the patient 500 to 1500 mg. of N-(4- propylbenzenesulfonyl)-N'-(2,5-endornethylene 1,2,5,6- tetrahydrobenzyl urea.

The dosage of the novel compounds of the present invention for the treatment of diabetes depends on the age, weight, and condition of the patient being treated. Generally speaking, for adult oral administration the preferred unit dosage is 35 to 1000 mg. of active compound with a suitable pharmaceutical diluent and/or lubricant. One or two unit dosages are given one to four times a day. A total daily dose of from 125 to 3000 mg. embraces the preferred range for the treament of diabetes. The total daily dose can be administered as a single dose, but preferably is administered in divided doses.

I claim:

1. N arylsulfonyl N (2,5-endomethylene-1,2,5,6- tetrahydrobenzy1)urea of the formula:

X ll

wherein X and Y are selected from .the group consisting of hydrogen, alkyl of 1 to 4 carbon atoms, inclusive, alkoxy of l to 4 carbon atoms, inclusive, alkanoyl of 2 to 4 carbon atoms. inclusive, halogen, and amino.

2. N arylsulionyl-N'-(2,5-endomethylene-l,2,5,6-tetrahydrobenzyl) urea of the formula:

wherein X is alkyl of 1 to 4 carbon atoms, inclusive.

3. N arylsulfonyl-N'-(2,S-endometbylene-1,2,5,6-tetrahydrobenzyhurea of the formula:

wherein X is halogen.

4. N arylsulfonyl-N'-(2,5-endomethylene-1,2,5,6-tetrahydrobenzyl)urea of the formula:

wherein X is alkoxy of 1 to 4 carbon atoms, inclusive.

5. N arylsulfonyl-N'-(2,5-endomethylene-1,2,5,6-tetrahydrobenzyl)urea of the formula:

6. N arylsulfonyl-N-(2,5-enclomethylene-1,2,5,6-tet rahydrobenz'yDurea of the formula:

@somn-o-nnon wherein X is the acyl group of an alkanoic acid of 2 to 4 carbon atoms.

7. N (4-chlorobenzenesulfonyl)-N'-(2,5-endomethylene-l,2,5,6-tetrahydrobenzyl)urea.

8. N (4-methylbenzenesulfonyl)-N'-(2,5-endomethylcue-1,2,5,6-tetrahydrobenzyl) urea.

References Cited in the file of this patent UNITED STATES PATENTS 2,804,422 Schumann et al Aug. 27, 1957 2,902,404 Spencer Sept. 1, 1959 2,907,692 Haack et al Oct. 6, 1959 2,928,871 Aeschlimann Mar. 15, 1960 2,964,560 I-laack et al Dec. 13, 1960 2,974,166 Aeschlimann Mar. 7, 1961 OTHER REFERENCES Ruschig et a1,: Arzn. Forschung, volume 8, No. 74, pages 448-451, July 1958. 

1. N - ARYLSULFONYL - N'' - (2,5-ENDOMETHYLENE-1,2,5,6, TETRAHYDROBENZYL) UREA OF THE FORMULA: 